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Stock Based Compensation
6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation
Stock Based Compensation — Compensation expense associated with RSUs and restricted stock was recognized based on the fair value of the instruments, over the instruments’ vesting period. The following table reflects the statements of income line items for stock based compensation expense for the periods stated:
 
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
Operating Expense Category
 
2014
 
2013
 
2014
 
2013
 
 
(Dollars in thousands)
Cost of revenue
 
$
81

 
$
49

 
$
162

 
$
98

Service, rental and maintenance
 
(17
)
 
20

 
$
22

 
$
40

Selling and marketing
 
131

 
119

 
262

 
238

General and administrative
 
429

 
440

 
1,264

 
878

Total stock based compensation
 
$
624

 
$
628

 
$
1,710

 
$
1,254



The decrease of compensation expense associated with service, rental and maintenance during the three months ended June 30, 2014 compared to the same period in 2013 was due to forfeitures of eligible RSUs in the second quarter of 2014.